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Please help me to solve this fairly simple problem (i think):

Gearbox output torque driving the input shaft to pump = 0.12348 Nm

Gearbox output speed - 80 rpm

Gearbox input speed - 4 rpm

Gearbox is compound consisting of x4 gears arranged in two pairs -

Gear A, driver = 100 teeth

Gear B, driven = 20 teeth

Gear C, driver = 80 teeth

Gear D, driven = 20 teeth

Gearbox Ratio = 1:20

How do I calculate the input torque?

Thanks in advance

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# Gearbox torque calculation - input/output

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